/*
 * Copyright (C) 2015-2018 Alibaba Group Holding Limited
 */


#ifndef NGHTTP2_OPTION_H
#define NGHTTP2_OPTION_H

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */

#include "nghttp2.h"

/**
 * Configuration options
 */
typedef enum {
  /**
   * This option prevents the library from sending WINDOW_UPDATE for a
   * connection automatically.  If this option is set to nonzero, the
   * library won't send WINDOW_UPDATE for DATA until application calls
   * nghttp2_session_consume() to indicate the amount of consumed
   * DATA.  By default, this option is set to zero.
   */
  NGHTTP2_OPT_NO_AUTO_WINDOW_UPDATE = 1,
  /**
   * This option sets the SETTINGS_MAX_CONCURRENT_STREAMS value of
   * remote endpoint as if it is received in SETTINGS frame. Without
   * specifying this option, before the local endpoint receives
   * SETTINGS_MAX_CONCURRENT_STREAMS in SETTINGS frame from remote
   * endpoint, SETTINGS_MAX_CONCURRENT_STREAMS is unlimited. This may
   * cause problem if local endpoint submits lots of requests
   * initially and sending them at once to the remote peer may lead to
   * the rejection of some requests. Specifying this option to the
   * sensible value, say 100, may avoid this kind of issue. This value
   * will be overwritten if the local endpoint receives
   * SETTINGS_MAX_CONCURRENT_STREAMS from the remote endpoint.
   */
  NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS = 1 << 1,
  NGHTTP2_OPT_NO_RECV_CLIENT_MAGIC = 1 << 2,
  NGHTTP2_OPT_NO_HTTP_MESSAGING = 1 << 3,
  NGHTTP2_OPT_MAX_RESERVED_REMOTE_STREAMS = 1 << 4,
  NGHTTP2_OPT_USER_RECV_EXT_TYPES = 1 << 5,
  NGHTTP2_OPT_NO_AUTO_PING_ACK = 1 << 6,
  NGHTTP2_OPT_BUILTIN_RECV_EXT_TYPES = 1 << 7,
  NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH = 1 << 8,
  NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE = 1 << 9,
  NGHTTP2_OPT_NO_CLOSED_STREAMS = 1 << 10,
} nghttp2_option_flag;

/**
 * Struct to store option values for nghttp2_session.
 */
struct nghttp2_option {
  /**
   * NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH
   */
  size_t max_send_header_block_length;
  /**
   * NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE
   */
  size_t max_deflate_dynamic_table_size;
  /**
   * Bitwise OR of nghttp2_option_flag to determine that which fields
   * are specified.
   */
  uint32_t opt_set_mask;
  /**
   * NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS
   */
  uint32_t peer_max_concurrent_streams;
  /**
   * NGHTTP2_OPT_MAX_RESERVED_REMOTE_STREAMS
   */
  uint32_t max_reserved_remote_streams;
  /**
   * NGHTTP2_OPT_BUILTIN_RECV_EXT_TYPES
   */
  uint32_t builtin_recv_ext_types;
  /**
   * NGHTTP2_OPT_NO_AUTO_WINDOW_UPDATE
   */
  int no_auto_window_update;
  /**
   * NGHTTP2_OPT_NO_RECV_CLIENT_MAGIC
   */
  int no_recv_client_magic;
  /**
   * NGHTTP2_OPT_NO_HTTP_MESSAGING
   */
  int no_http_messaging;
  /**
   * NGHTTP2_OPT_NO_AUTO_PING_ACK
   */
  int no_auto_ping_ack;
  /**
   * NGHTTP2_OPT_NO_CLOSED_STREAMS
   */
  int no_closed_streams;
  /**
   * NGHTTP2_OPT_USER_RECV_EXT_TYPES
   */
  uint8_t user_recv_ext_types[32];
};

#endif /* NGHTTP2_OPTION_H */
